摘要:

AbstractIt is shown that by assuming all chain growth in the Fischer Tropsch synthesis takes place on identical sites and that the various paraffins, olefins and alcohols produced are simply the consequence of different modes of termination, product distributions which agree with experimental observations are generated. In particular the reason for the “break” in paraffin distributions is seen to be the fact that paraffins can be formed by a termination involving either the addition of a hydrogen atom or of a CH3to the growing chain. Since there is no comparable duality in the mode of olefin formation, olefin distributions do not show a br

ISSN:0008-4034    

DOI:10.1002/cjce.5450640121

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY

摘要:

AbstractAn algorithm is described for the systematic derivation of expressions for first and second thermodynamic derivatives involving the use of Jacobians. The algorithm is implemented by means of a list‐processing language in conjunction with a commercially available symbolic mathematical system for use with a microcomputer. The algorithm is intended to replace tables and procedures currently used “by hand”. Attention is limited in this paper to simple systems with two degrees of freedom, but the algorithm is to be extended ultimately to chemical systems subject to equilibrium constraints. Examples are given to illustrate the proc

ISSN:0008-4034    

DOI:10.1002/cjce.5450640122

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY

摘要:

AbstractA corresponding states correlation is developed for thep ‐ v ‐ Tproperties of saturated liquids. It is similar in form to a previous correlation; however it is more accurate in the low pressure, low Pitzer factor range, owing to the incorporation of new information about low Pitzer factor behavior. The problem of creating corresponding states correlations of the spinodal lines and the metastable states is also discussed in the light of new equation of state information. A partial preliminary correlation works particularly well for non‐polar molecules in the range of fairly small positive Pitzer fa

ISSN:0008-4034    

DOI:10.1002/cjce.5450640123

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY

摘要:

AbstractThis paper describes a new approach for synthesizing thermally integrated distillation sequences. There are two key developments in this research. First, the overall flowsheet is optimized simultaneously as opposed to the traditional technique of optimizing each tower sequentially followed by heat integration. Second, maximum energy recovery techniques are used to estimate the total energy requirements of the thermally integrated network, eliminating the need to synthesize a heat exchanger network on each function evaluation in the optimization routine. A frequently reported five component light alkane system (Rathore's Problem) was used to illustrate this approach. Optimized process flowsheets, energy savings and a comparison with literature values are presented.

ISSN:0008-4034    

DOI:10.1002/cjce.5450640124

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY

摘要:

AbstractThe “critical concentration” of solids, defined by Trawinski as the break‐point from linearity in the plot of log (C/Co) versus θ in any elutriation process, represents the attainment of a sudden increase in bed viscosity which finally leads to a retentive capacity of the bed with respect to the fines, characterized by the “equilibrium bed concentration”,CE.Experimental data onCchave been correlated empirically with various system parameters as\documentclass[article]\pagestyle[empty]\begin[document]$$ C_c = 2.23\left( [\frac[G] [[G_[me] ]]] \right)^[ - 2.07] \left( [\frac[[d_1 ]] [[d_2 ]]] \right)^[ - 0.15] \left( [\frac[[\rho _1 ]] [[\rho _2 ]]] \right)^[0.11] \left( [\frac[w] [W]] \right)^[1.24] \left( [\frac[[H_a ]] [[H_s ]]] \right)^[ - 0.17] $$\end[document]The ranges of the parameters are 1.1 ≤G/Gme≤ 1.4; 1.28 ≤d1/d2≤ 2.85; 1.0 ≤ ρ1/ρ2≤ 2.6; 0.50 ≤w/W

ISSN:0008-4034    

DOI:10.1002/cjce.5450640125

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450640127

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1986

数据来源: WILEY